Concept 4 of 5
Calendar Logic
Today's big idea
The week repeats every 7 days
Dates 7 apart share a day.
How it works
👀 What's going on?
A week always has seven days, and it never changes its order. That steady rhythm lets you jump from one day to another, or from one date to the next same-day, without a calendar in front of you.
💡 Here's the trick
Look at the problem above. Because a week is 7 days long, the same day comes round again every 7 days. So dates 7 apart share a day, and you can count days forward around the week.
- 1.Note the day or date you are given.
- 2.Count forward the number of days asked (or add 7 for the next same-day).
- 3.Wrap around the week if you pass Sunday.
✍️ Try it
The 1st of a month is a Monday. What day is the 8th? The 8th is 7 days after the 1st, and 7 days later is the same day, so the 8th is also Monday.
⚠️ Watch out
After Sunday, the week starts again at Monday. When you count forward past the weekend, loop back to the start of the week.
See it in action
⚡ Time to play!
A week has 7 days. Tap each next day to hop forward and watch where you land.
Start on the 1st (a Monday). Hop 7 days forward.
Hop 0 of 7 — tap the next day →
Quick check
✅ VERIFICATION
If the 5th of a month is a Sunday, what date is the next Sunday?
⚡ Finish the activity above first to answer.
Keep going!
Up next: Pattern Detective
Doubling, growing gaps, or a sneaky mistake.